CN216526177U - Low-voltage characteristic tester for high-voltage circuit breaker - Google Patents
Low-voltage characteristic tester for high-voltage circuit breaker Download PDFInfo
- Publication number
- CN216526177U CN216526177U CN202122668009.8U CN202122668009U CN216526177U CN 216526177 U CN216526177 U CN 216526177U CN 202122668009 U CN202122668009 U CN 202122668009U CN 216526177 U CN216526177 U CN 216526177U
- Authority
- CN
- China
- Prior art keywords
- relay
- voltage
- switching
- dial switch
- path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model relates to a low-voltage characteristic tester of a high-voltage circuit breaker, which comprises a voltage regulating circuit and a control circuit, wherein the voltage regulating circuit is used for regulating voltage to perform a split-phase test; the voltage regulating circuit is respectively connected with the switching-on control branch, the first switching-off control branch or the second switching-off control branch through a relay; the tester is characterized in that the control circuit is provided with a wiring terminal, and the tester is connected with an external high-voltage circuit breaker operating mechanism through the wiring terminal for testing. The utility model solves the requirement of three-phase respective operation tests of the GIS high-voltage circuit breaker, can realize low-voltage test verification, is convenient for field work, and reduces the frequent actions of the circuit breaker. The switching-on operation and the switching-off operation are both in an impulse type mode, the problem that a coil is electrified for a long time is avoided, equipment is safer, and damage to the equipment caused by tests is avoided.
Description
Technical Field
The utility model relates to the field of circuit breaker testing, in particular to a low-voltage characteristic tester of a high-voltage circuit breaker.
Background
In factory areas such as large power plants, large chemical plants, oil refineries, etc., GIS high-voltage circuit breakers are indispensable. The GIS high-voltage circuit breakers generally have a single A/B/C three-phase operating mechanism, the operating mechanisms need to be tested and verified respectively, the existing equipment does not have a split-phase test function and only has two outputs of opening and closing, three coils of closing, a first opening and a second opening exist on the operating mechanism of the GIS high-voltage circuit breaker actually, and the wires need to be changed frequently in the test process.
In addition, for a high-voltage circuit breaker, a low-voltage characteristic testing device on the market is complex in wiring, inflexible in operation and free of a phase splitting function, so that the risk of wire disconnection in a test is increased. And the three-phase respective control operation function is not provided, the condition that the breaker frequently acts for many times is easy to occur in the test process, and the service life of the breaker is adversely affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low-voltage characteristic tester of a high-voltage circuit breaker, which can independently test or simultaneously test three phases.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the low-voltage characteristic tester for the high-voltage circuit breaker is constructed and comprises a voltage regulating circuit and a control circuit, wherein the voltage regulating circuit is used for regulating voltage to perform a phase splitting test, the voltage regulating circuit is connected with the control circuit, and the control circuit comprises a closing control branch, a first switching control branch and a second switching control branch; the voltage regulating circuit is respectively connected with the switching-on control branch, the first switching-off control branch or the second switching-off control branch through a relay;
the tester is characterized in that the control circuit is provided with a wiring terminal, and the tester is connected with an external high-voltage circuit breaker operating mechanism through the wiring terminal for testing.
Preferably, the voltage regulating circuit comprises an adjustable switching power supply and an enable switch, an input end of the adjustable switching power supply is connected with mains supply, an anode of the adjustable switching power supply is connected to a first end of the enable switch, a second end of the enable switch is connected to a first relay, and one path of the first relay is connected to a common end; one path is connected to the negative electrode of the adjustable switching power supply; one path is connected to the control circuit.
Preferably, the voltage regulating circuit further comprises a voltmeter for measuring the output voltage; one path of the first relay is connected with a common end through the voltmeter; one path is connected with the negative electrode of the adjustable switching power supply through the voltmeter.
Preferably, the switching-on control branch comprises a first a-phase dial switch, a first B-phase dial switch and a first C-phase dial switch; the voltage regulating circuit is connected with the switching-on control branch circuit through a second relay;
the first brake control branch comprises a second A-phase dial switch, a second B-phase dial switch and a second C-phase dial switch; the voltage regulating circuit is connected with the first brake control branch circuit through a third relay;
the second shunt control branch comprises a third A-phase dial switch, a third B-phase dial switch and a third C-phase dial switch; and the voltage regulating circuit is connected with the second shunt control branch circuit through a fourth relay.
Preferably, one path of the first relay is connected to the first end of the second relay, the other path of the first relay is connected to the first end of the third relay, and the other path of the first relay is connected to the first end of the fourth relay;
one path of the second end of the second relay is connected to the first end of the first A-phase dial switch, and the other path of the second end of the second relay is connected to the first end of the first B-phase dial switch; one path is connected to the first end of the first C-phase dial switch; one path of the second end of the third relay is connected to the first end of the second A-phase dial switch, and the other path of the second end of the third relay is connected to the first end of the second B-phase dial switch; one path is connected to the first end of the second C-phase dial switch; one path of the second end of the fourth relay is connected to the first end of the third A-phase dial switch, and the other path of the second end of the fourth relay is connected to the first end of the third B-phase dial switch; one path is connected to the first end of the third C-phase dial switch.
Preferably, the connection terminal comprises a closing detection terminal, a first opening detection terminal and a second opening detection terminal;
the switching-on detection terminal is arranged at the end part of the switching-on control branch, the first switching-off detection terminal is arranged at the end part of the first switching-off control branch, and the second switching-off detection terminal is arranged at the end part of the second switching-off control branch.
Preferably, the tester further comprises an AC-DC module power supply, a controller and a touch screen; the power input end of the AC-DC module is connected with commercial power, and the power output end of the AC-DC module is connected with the input end of the controller; the output end of the controller is respectively connected to the first relay, the second relay, the third relay and the fourth relay so as to control the relays to debug; the touch screen is connected with the controller so as to control the tester through the touch screen.
Preferably, the controller is microcomputer controller, microcomputer controller output terminal Y1 is connected all the way first relay and connect back to the common port, microcomputer controller output terminal Y2 is connected all the way the second relay and connect back to the common port, microcomputer controller output terminal Y3 is connected all the way the third relay and connect back to the common port, microcomputer controller output terminal Y4 is connected all the way the fourth relay and connect back to the common port.
Preferably, the first relay is an electromagnetic relay, and the second relay, the third relay and the fourth relay are all time relays.
Preferably, the action time of the second relay, the third relay and the fourth relay is 200 ms.
The implementation of the utility model has the following beneficial effects: the utility model solves the requirement of three-phase respective operation tests of the GIS high-voltage circuit breaker, can realize low-voltage test verification, is convenient for field work, and reduces the frequent actions of the circuit breaker. The switching-on operation and the switching-off operation are both in an impulse type mode, the problem that a coil is electrified for a long time is avoided, equipment is safer, and damage to the equipment caused by tests is avoided.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic circuit diagram of a low voltage characteristic tester of a high voltage circuit breaker according to the present invention;
fig. 2 is a schematic circuit diagram of a first embodiment of the low voltage characteristic tester for the high voltage circuit breaker of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.
It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the utility model. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
As shown in fig. 1, the low voltage characteristic tester for the high voltage circuit breaker according to the present invention can flexibly operate the opening and closing operations of the high voltage circuit breaker when the GIS high voltage circuit breaker is stopped and repaired, and can adjust the operating voltage and measure the minimum operating voltage of the GIS high voltage circuit breaker, and in addition, has an automatic control function, and can verify whether the high voltage circuit breaker can complete the test of two times of opening and closing operations within 180 seconds. The tester comprises a voltage regulating circuit 1 and a control circuit 2, wherein the voltage regulating circuit 1 is used for regulating voltage to perform a split-phase test, the voltage regulating circuit 1 is connected with the control circuit 2, and the control circuit 2 comprises a closing control branch 21, a first opening control branch 22 and a second opening control branch 23; the voltage regulating circuit 1 is respectively connected with the closing control branch 21, the first opening control branch 22 or the second opening control branch 23 through a relay;
and the control circuit 2 is provided with a wiring terminal, and the tester is connected with an operating coil of an external high-voltage circuit breaker operating mechanism through the wiring terminal for testing.
Further, the voltage regulating circuit 1 comprises an adjustable switching power supply and an enable switch S3, the input end of the adjustable switching power supply is connected with 220V mains supply, the anode of the adjustable switching power supply is connected to a first end of the enable switch S3, a second end of the enable switch S3 is connected to a first relay 001XR, and one path of the first relay 001XR is connected to a common end COM; one path is connected to the negative electrode of the adjustable switching power supply; one path is connected to the control circuit 2. The enable switch S3 is a power output enable switch, and is turned off when the test is not performed, thereby preventing human error operation.
Further, the adjustable voltage range of the adjustable switching power supply is 0-130V. The adjustable switching power supply is adjustable within the range of 0-130V, and the requirement of a power supply of an operating mechanism of the GIS high-voltage circuit breaker is met. Understandably, the adjustable switching power supply with different adjustable voltage ranges can be selected according to requirements.
Further, the voltage regulating circuit 1 further comprises a voltmeter V1 for measuring the output voltage; one path of the first relay 001XR is connected with a common end COM through a voltmeter V1; one path is connected with the negative electrode of the adjustable switching power supply through a voltmeter V1. The voltmeter can measure the output voltage in real time, and overvoltage faults are prevented.
Further, the closing control branch comprises a first A-phase dial switch, a first B-phase dial switch and a first C-phase dial switch; the voltage regulating circuit 1 is connected with the switching-on control branch 21 through a second relay 002 XR;
the first switching control branch 22 comprises a second a-phase dial switch, a second B-phase dial switch and a second C-phase dial switch; the voltage regulating circuit 1 is connected with the first brake control branch 22 through a third relay 003 XR;
the second shunt control branch 23 comprises a third A-phase dial switch, a third B-phase dial switch and a third C-phase dial switch; the voltage regulating circuit 1 is connected with the second shunt control branch 23 through a fourth relay 004 XR.
Further, first relay 001XR is an electromagnetic relay, and second relay 002XR, third relay 003XR and fourth relay 004XR are time relays.
Further, the first relay 001XR is connected all the way to the first end of the second relay 002XR, all the way to the first end of the third relay 003XR, all the way to the first end of the fourth relay 004 XR;
one path of a second end of the second relay 002XR is connected to a first end of the first a-phase dial switch, and the other path is connected to a first end of the first B-phase dial switch; one path is connected to the first end of the first C-phase dial switch; one path of a second end of a third relay 003XR is connected to a first end of a second A-phase dial switch, and the other path of the second end of the third relay is connected to a first end of a second B-phase dial switch; one path is connected to the first end of the second C-phase dial switch; one path of a second end of a fourth relay 004XR is connected to a first end of a third A-phase dial switch, and the other path of the second end of the fourth relay is connected to a first end of a third B-phase dial switch; one path is connected to the first end of the third C-phase dial switch.
Furthermore, the connecting terminal comprises a closing detection terminal, a first opening detection terminal and a second opening detection terminal; the closing detection terminal is arranged at the end of the closing control branch 21, the first opening detection terminal is arranged at the end of the first opening control branch 22, and the second opening detection terminal is arranged at the end of the second opening control branch 23. The tester is respectively connected with an operating coil of an external high-voltage circuit breaker operating mechanism through the wiring terminals for testing.
As shown in fig. 2, further, the tester further comprises an AC-DC module power supply, a controller and a touch screen; the power input end of the AC-DC module is connected with 220V commercial power, the power output end of the AC-DC module is 5V, and the power output end of the AC-DC module is connected to the input end of the controller; the output end of the controller is respectively connected to a first relay 001XR, a second relay 002XR, a third relay 003XR and a fourth relay 004XR so as to control the relays to debug; the touch screen is connected with the controller to control the tester through the touch screen. The controller control is passed through in experiment to control power output through first relay 001XR, second relay 002XR, third relay 003XR and fourth relay 004XR, in order to realize whole experiment, the button that experimental used all sets up on the operating panel of touch-sensitive screen, for virtual button, increases the link of confirming, in order to prevent that the people from because of the maloperation.
Further, the controller is the microcomputer controller, and microcomputer controller output terminal Y1 connects first relay 001XR and connects back to common port COM all the way, and microcomputer controller output terminal Y2 connects second relay 002XR and connects back to common port COM all the way, and microcomputer controller output terminal Y3 connects third relay 003XR and connects back to common port COM all the way, and microcomputer controller output terminal Y4 connects fourth relay 004XR and connects back to common port COM all the way.
Further, the controller includes, but is not limited to, a microprocessor, a microcontroller, a digital signal processor, a microcomputer, a central processing unit, a field programmable gate array, a programmable logic device, a state machine, a logic circuit, an analog circuit, a digital circuit and/or any device that operates signals (analog and/or digital) based on operation instructions, which may be modified or innovated according to the need by using a control scheme such as a commercially available master MCU, and the like, and will not be described in detail herein.
Further, the action time of the second relay 002XR, the third relay 003XR, and the fourth relay 004XR is 200 ms.
It is understood that the second relay 002XR, the third relay 003XR and the fourth relay 004XR make the electric pulse width of the coil default to 200ms, and the pulse width can be adjusted according to the coil.
The low-voltage characteristic tester of the high-voltage circuit breaker can respectively perform an opening and closing operation test, a low-voltage characteristic operation test and a circuit breaker reclosing function test, and is used for testing the opening and closing performance of the circuit breaker and the lowest action voltage of the high-voltage circuit breaker.
The first and second switching operation tests are as follows:
(1) and the normal opening and closing operation test is carried out under the rated operation voltage, and the voltage of the adjustable switching power supply is adjusted to the rated voltage, such as 110V.
(2) And the enable switch S3 is pressed, and the voltage output is enabled. And selecting an A/B/C three-phase dial switch beside the closing detection terminal to determine the opening and closing phase.
(3) The virtual closing button of touch-sensitive screen is pressed down, and click "confirm", microcomputer control ware Y1 is closed, and the excitation of first relay 001XR, first relay 001XR contact are closed.
(4) And the microcomputer controller Y2 is closed, and after the second relay 002XR is excited, the contact is disconnected after being closed for 200ms, so that the corresponding closing coil obtains a 200ms rated voltage pulse, and the breaker is closed.
(5) The microcomputer controller Y1 and the Y2 are disconnected, and the first relay 001XR and the second relay 002XR lose power and lose magnetism.
(6) And observing the voltage, determining that the voltage indication returns to 0V, and if not, emergently powering off the tester.
(7) And pressing the virtual first brake control button of the touch screen, clicking 'confirm', closing the microcomputer controller Y1, exciting the first relay 001XR, and closing the first relay 001XR contact. And after the microcomputer controller Y3 is closed and the third relay 003XR is excited, the contact is opened after being closed for 200ms, so that the corresponding first switching coil obtains a 200ms rated voltage pulse, and the breaker is switched off.
(8) And the microcomputer is disconnected with Y1 and Y3, the first relay 001XR and the third relay 003XR lose power and lose magnetism.
(9) And observing the voltage, determining that the voltage indication returns to 0V, and if not, emergently powering off the tester.
(10) The second opening coil was verified in the same manner as described above.
(11) And the enabling switch S3 is turned off, the voltage output is cut off, and the test is finished.
The low-voltage characteristic operation test is similar to the switching-on and switching-off operation test, but the voltage of a switching power supply needs to be regulated, and the circuit breaker needs to be subjected to switching-on and switching-off operation for multiple times. Understandably, the voltage of the low voltage characteristic test can be adjusted according to actual conditions.
Second, the low voltage characteristic operation test is as follows:
(1) and adjusting the adjustable switching power supply to a voltage value of 30% of rated voltage, and performing switching-on, first switching-off and second switching-off control operations on the circuit breaker respectively to determine that the circuit breaker cannot be switched on and off.
(2) And adjusting the adjustable switching power supply to a voltage value of 65% of rated voltage, and performing switching-on, first switching-off and second switching-off control operations on the circuit breaker respectively to determine that the circuit breaker can be reliably switched on and off.
(3) And slowly adjusting the power supply voltage from a voltage value of 30% of the rated voltage, performing closing operation in a matching manner until the circuit breaker can be closed, and recording the voltage as the lowest action voltage of the circuit breaker. The test requires phase separation, i.e., phase A is completed first, and then phase B and phase C are performed.
(4) And respectively measuring the lowest action voltage of the first opening and the second opening of the circuit breaker by using the same method.
Thirdly, the circuit breaker reclosing function test is as follows: after the energy storage is finished, the hydraulic and hydraulic spring operating mechanisms can meet the requirement of one-time brake opening- (0.3 second delay) closing-opening test. And after 180 seconds, the switching-on and switching-off operation can be completed again. The time fixed value of the time delay of 180s can be adjusted according to the actual situation of the site.
The utility model solves the requirement of three-phase respective operation tests of the GIS high-voltage circuit breaker, can realize low-voltage test verification, is convenient for field work, and reduces the frequent actions of the circuit breaker. Meanwhile, a touch screen virtual button is adopted, and a confirmation link is added, so that human errors are prevented, and the size of the panel is reduced. The switching-on operation and the switching-off operation are both in an impulse type mode, the problem that a coil is electrified for a long time is avoided, equipment is safer, and damage to the equipment caused by tests is avoided.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the utility model, are given by way of illustration and description, and are not to be construed as limiting the scope of the utility model; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. The low-voltage characteristic tester of the high-voltage circuit breaker is characterized by comprising a voltage regulating circuit and a control circuit, wherein the voltage regulating circuit is used for regulating voltage to perform a split-phase test, the voltage regulating circuit is connected with the control circuit, and the control circuit comprises a closing control branch, a first opening control branch and a second opening control branch; the voltage regulating circuit is respectively connected with the switching-on control branch, the first switching-off control branch or the second switching-off control branch through a relay;
the tester is characterized in that the control circuit is provided with a wiring terminal, and the tester is connected with an external high-voltage circuit breaker operating mechanism through the wiring terminal for testing.
2. The low-voltage characteristic tester for the high-voltage circuit breaker according to claim 1, wherein the voltage regulating circuit comprises an adjustable switch power supply and an enable switch, an input end of the adjustable switch power supply is connected with a mains supply, an anode of the adjustable switch power supply is connected to a first end of the enable switch, a second end of the enable switch is connected to a first relay, and one path of the first relay is connected to a common end; one path is connected to the negative electrode of the adjustable switching power supply; one path is connected to the control circuit.
3. The low voltage characteristic tester of the high voltage circuit breaker according to claim 2, wherein the voltage regulating circuit further comprises a voltmeter for measuring an output voltage; one path of the first relay is connected with a common end through the voltmeter; one path is connected with the negative electrode of the adjustable switching power supply through the voltmeter.
4. The low voltage characteristic tester for high voltage circuit breaker according to claim 2,
the switching-on control branch comprises a first A-phase dial switch, a first B-phase dial switch and a first C-phase dial switch; the voltage regulating circuit is connected with the switching-on control branch circuit through a second relay;
the first brake control branch comprises a second A-phase dial switch, a second B-phase dial switch and a second C-phase dial switch; the voltage regulating circuit is connected with the first brake control branch circuit through a third relay;
the second shunt control branch comprises a third A-phase dial switch, a third B-phase dial switch and a third C-phase dial switch; and the voltage regulating circuit is connected with the second shunt control branch circuit through a fourth relay.
5. The low voltage characteristic tester of the high voltage circuit breaker according to claim 4, wherein the first relay is connected to the first terminal of the second relay in one way, the first terminal of the third relay in one way, and the first terminal of the fourth relay in one way;
one path of the second end of the second relay is connected to the first end of the first A-phase dial switch, and the other path of the second end of the second relay is connected to the first end of the first B-phase dial switch; one path is connected to the first end of the first C-phase dial switch; one path of the second end of the third relay is connected to the first end of the second A-phase dial switch, and the other path of the second end of the third relay is connected to the first end of the second B-phase dial switch; one path is connected to the first end of the second C-phase dial switch; one path of the second end of the fourth relay is connected to the first end of the third A-phase dial switch, and the other path of the second end of the fourth relay is connected to the first end of the third B-phase dial switch; one path is connected to the first end of the third C-phase dial switch.
6. The low voltage characteristic tester of the high voltage circuit breaker according to claim 5, wherein the connection terminal includes a closing detection terminal, a first opening detection terminal and a second opening detection terminal;
the switching-on detection terminal is arranged at the end part of the switching-on control branch, the first switching-off detection terminal is arranged at the end part of the first switching-off control branch, and the second switching-off detection terminal is arranged at the end part of the second switching-off control branch.
7. The high voltage circuit breaker low voltage characteristic tester as claimed in claim 4, wherein the tester further comprises an AC-DC module power supply, a controller and a touch screen; the power input end of the AC-DC module is connected with commercial power, and the power output end of the AC-DC module is connected with the input end of the controller; the output end of the controller is respectively connected to the first relay, the second relay, the third relay and the fourth relay so as to control the relays to debug; the touch screen is connected with the controller so as to control the tester through the touch screen.
8. The high voltage circuit breaker low voltage characteristic tester as claimed in claim 7, wherein the controller is a microcomputer controller, the microcomputer controller output terminal Y1 is connected to the first relay and connected back to the common terminal, the microcomputer controller output terminal Y2 is connected to the second relay and connected back to the common terminal, the microcomputer controller output terminal Y3 is connected to the third relay and connected back to the common terminal, and the microcomputer controller output terminal Y4 is connected to the fourth relay and connected back to the common terminal.
9. The low voltage characteristic tester of the high voltage circuit breaker according to claim 4, wherein the first relay is an electromagnetic relay, and the second relay, the third relay and the fourth relay are all time relays.
10. The low voltage characteristic tester of the high voltage circuit breaker according to claim 9, wherein the action time of the second relay, the third relay and the fourth relay is 200 ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122668009.8U CN216526177U (en) | 2021-11-02 | 2021-11-02 | Low-voltage characteristic tester for high-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122668009.8U CN216526177U (en) | 2021-11-02 | 2021-11-02 | Low-voltage characteristic tester for high-voltage circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216526177U true CN216526177U (en) | 2022-05-13 |
Family
ID=81527786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122668009.8U Active CN216526177U (en) | 2021-11-02 | 2021-11-02 | Low-voltage characteristic tester for high-voltage circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216526177U (en) |
-
2021
- 2021-11-02 CN CN202122668009.8U patent/CN216526177U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9606185B2 (en) | Intelligent calibration system for backup-power automatic switching device | |
| CN102780206B (en) | Electric leakage detection protecting circuit | |
| CN109100662B (en) | Intelligent high-voltage isolating switch AC/DC voltage regulation power supply test operation system | |
| CN111694288A (en) | On-site feeder automation function closed-loop automatic test platform | |
| CN111239652A (en) | Polarity testing device for current transformer | |
| CN209707671U (en) | Transformer station direct current system resistance test device over the ground | |
| CN109188263B (en) | High-voltage isolating switch AC/DC voltage regulation power supply test operation secondary circuit system | |
| CN111352026A (en) | Online testing device and online testing method for non-full-phase protection of circuit breaker body | |
| CN112649726B (en) | Switch class mechanical life test circuit and method | |
| CN216526177U (en) | Low-voltage characteristic tester for high-voltage circuit breaker | |
| CN101055814B (en) | High voltage vacuum breaker | |
| CN203927005U (en) | Electric valve control circuit and the electric operated valve instrument that comprises this circuit | |
| CN115718255A (en) | Detection circuit, detection method, detection device, energy storage system and readable storage medium | |
| CN212229071U (en) | Instrument aging testing cabinet | |
| CN115184822A (en) | HI-POT testing device with multi-channel switching and contact self-checking method thereof | |
| CN209247978U (en) | High voltage isolator alternating current-direct current voltage regulation power supply test operation secondary circuit system | |
| CN111443281B (en) | Electrical blocking device and circuit breaker or isolating switch | |
| CN111751715A (en) | Be applied to primary loop detection device of circuit breaker | |
| CN105954626B (en) | Portable microcomputer busbar protective device tester | |
| CN219392220U (en) | On-off capability test circuit and on-off capability test equipment | |
| JPH09219923A (en) | Ground relay | |
| CN110988666B (en) | Device for detecting voltage bearing and current bearing of relay contact | |
| CN216526175U (en) | Resistive load life monitoring system of JL contactor | |
| CN211826442U (en) | Fault current fusing element state detection device | |
| CN216771920U (en) | Pull electronic isolator divide-shut brake circuit detection device of power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |